Change Duct Loss Coefficient to Another Fitting in ASHRAE Table

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import clr
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.ExternalService import *
from Autodesk.Revit.DB.ExtensibleStorage import *
from System.Collections.Generic import *

clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)

clr.ImportExtensions(Revit.GeometryConversion)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
from System.Collections.Generic import *

doc = DocumentManager.Instance.CurrentDBDocument
uidoc=DocumentManager.Instance.CurrentUIApplication.ActiveUIDocument

def getServerById(serverGUID, serviceId):
	service = ExternalServiceRegistry.GetService(serviceId)
	if service != "null" and serverGUID != "null":
		server = service.GetServer(serverGUID)
		if server != "null":
			return server
	return null
lc=[]	
def getLossMethods(serviceId):
	service = ExternalServiceRegistry.GetService(serviceId)
	serverIds = service.GetRegisteredServerIds()
	list=List[ElementId]()
	for serverId in serverIds:
		server = getServerById(serverId, serviceId)
		#ductServer = server.IDuctFittingAndAccessoryPressureDropServer
		
		id=serverId
		name=server.GetName()
		lc.append(id)
		lc.append(name)
		lc.append(server)
		
	return lc
	

elems_=UnwrapElement(IN[0])
SetNew= IN[1]
elem=[]


elems=zip(elems_, SetNew)

for el in elems:
	eleId = el[0].Id
	fitting =doc.GetElement(eleId)
	param = fitting.get_Parameter(BuiltInParameter.RBS_DUCT_FITTING_LOSS_METHOD_SERVER_PARAM )#)
	lc = getLossMethods(ExternalServices.BuiltInExternalServices.DuctFittingAndAccessoryPressureDropService)

	schema = lc[2].GetDataSchema()
	
	
	field = schema.GetField("ASHRAETableName") 
	entity=fitting.GetEntity(schema)
	 
	oldval = entity.Get[field.ValueType] (field) # obtaining values
		
	TransactionManager.Instance.EnsureInTransaction(doc)
	entity.Set[field.ValueType](field,el[1]) # SetNew # installation of a new coefficient value of certain
	fitting.SetEntity(entity)
	TransactionManager.Instance.TransactionTaskDone()
	elem.append(fitting)

OUT = elem ,lc, oldval
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